C#，未捕获 NullReferenceException-解网

问：

下午好。我不明白，为什么没有调用块“catch”，而是程序停止使用 NullReferenceException。

            string? nullable_string_1 = null;
            try
            {
                string non_nullable_string_1 = (string)nullable_string_1;
                System.Console.WriteLine(non_nullable_string_1.Length);
            }
            catch (System.NullReferenceException nullReferenceException)
            {
                System.Console.WriteLine($"There is an invalid operation exception with message: \"{nullReferenceException.Message}\"");
            }

C# 异常 try-catch nullreferenceexception

using System;

public class Program
{
    public static void Main()
    {
        string? nullableString = null;
        try
        {
            string nonNullableString = (string)nullableString;
            Console.WriteLine(nonNullableString.Length);
        }
        catch (NullReferenceException nullReferenceException)
        {
            Console.WriteLine($"There is an invalid operation exception with message: \"{nullReferenceException.Message}\"");
        }

        Console.WriteLine("After Exception Code Run");
    }
}

输出 - 它正在工作 [1]：https://i.stack.imgur.com/66Qum.png

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